/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/GeometryCollectionClusteringUtility.h
Cluster all source bones under an existing node, algorithm chooses best node to add to 'closest to root'
static void ClusterBonesUnderExistingNode ( [FGeometryCollection](API\Runtime\Chaos\GeometryCollection\FGeometryCollection) * GeometryCollection, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & SourceElements )